P6SMB120 Equivalent & Substitute Parts

Part Overview

The P6SMB120 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This part operates with a reverse standoff voltage of 102V and provides peak pulse current handling of 3.7A at a clamping voltage of 173.25V. The P6SMB120 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal operating ranges while meeting modern component availability and compliance standards.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	102V
Voltage - Breakdown (Min)	108V
Voltage - Clamping (Max) @ Ipp	173.25V
Current - Peak Pulse (10/1000µs)	3.7A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the P6SMB120 are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 102V
Voltage - Breakdown (Min): 108V minimum
Current - Peak Pulse (10/1000µs): 3.6A to 3.7A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Type: Zener, unidirectional
Operating Temperature: -55°C to -65°C minimum; 150°C maximum

The substitute parts listed below meet these core electrical specifications and are available in compatible surface-mount packaging. Clamping voltage variations within the 165V to 173.25V range are acceptable for general-purpose transient suppression applications, as they remain within the functional operating envelope for this voltage class.

Parameter Comparison

Parameter	P6SMB120 (Littelfuse)	P6SMB120A (Eaton)	P6SMB120A-E3/5B (Vishay)	SMBJP6KE120A-TP (Micro Commercial Co)
Voltage - Reverse Standoff (Typ)	102V	102V	102V	102V
Voltage - Breakdown (Min)	108V	114V	114V	114V
Voltage - Clamping (Max) @ Ipp	173.25V	165V	165V	165V
Current - Peak Pulse (10/1000µs)	3.7A	3.7A	3.6A	3.7A
Power - Peak Pulse	600W	600W	600W	600W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts are active products with current manufacturing status, addressing the obsolescence of the original P6SMB120. Selection among these alternatives should be based on the following factors:

P6SMB120A (Eaton - Electronics Division): Active product with 47,174 units in stock. Maintains identical electrical specifications to the original part with 3.7A peak pulse current and 165V clamping voltage. RoHS compliant. Suitable for telecom and general-purpose applications.

P6SMB120A-E3/5B (Vishay General Semiconductor - Diodes Division): Active product with 1,013 units in stock. Offers extended operating temperature range (-65°C to 150°C) compared to the original specification. Peak pulse current rated at 3.6A with 165V clamping voltage. ROHS3 compliant and REACH unaffected. Available in Tape & Reel packaging.

SMBJP6KE120A-TP (Micro Commercial Co): Active product with 3,680 units in stock. Maintains 3.7A peak pulse current and 165V clamping voltage. Extended operating temperature range (-65°C to 150°C). ROHS3 compliant and REACH unaffected. Supplied in Tape & Reel packaging.

All substitute parts are electrically compatible within the specified parameter tolerances and maintain the same surface-mount DO-214AA (SMB) package footprint.

Frequently Asked Questions (FAQ)

Q: Can P6SMB120A be used as a direct replacement for P6SMB120?

A: Yes. Both parts share identical reverse standoff voltage (102V), peak pulse current (3.7A), and power dissipation (600W). The clamping voltage difference (165V vs. 173.25V) remains within acceptable tolerance for general-purpose transient suppression. Package compatibility is maintained.

Q: What is the difference between the Eaton P6SMB120A and Vishay P6SMB120A-E3/5B?

A: Both maintain the same electrical specifications (102V standoff, 3.7A/3.6A peak pulse current, 165V clamping). The Vishay part offers an extended lower operating temperature limit (-65°C vs. -55°C) and is available in Tape & Reel packaging. The Eaton part is available in higher quantity inventory.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package, ensuring PCB footprint compatibility with the original P6SMB120.

Q: Do the substitute parts meet RoHS compliance?

A: Yes. All three substitute parts are RoHS compliant (either RoHS or ROHS3 standard), meeting current environmental and regulatory requirements.

Q: What is the significance of the clamping voltage difference between 173.25V and 165V?

A: The clamping voltage represents the maximum voltage across the diode during peak pulse conditions. The 165V rating of substitute parts is lower than the original 173.25V, providing slightly more aggressive transient suppression. This remains within acceptable operating parameters for the 102V standoff voltage class and does not compromise circuit protection.

Q: Can I use SMBJP6KE120A-TP if my application requires the -55°C minimum temperature specification?

A: Yes. SMBJP6KE120A-TP is rated for -65°C to 150°C, which exceeds the -55°C to 150°C requirement of the original part. Extended temperature range provides additional design margin.

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